
    class A{
        public A(){ System.out.println("A's constructor."); }
    }
    class B extends A{
        public B(){
//            super();//1
            System.out.println("B's constructor.");
        }
    }
    class C extends B{
        public C(){
//            super.B();//2
            System.out.println("C's constructor.");
        }
    }
    public class Main{
        public static void main(String args[]){
            C c = new C();
        }

    }
